2. rcu read lock receive_queue lock nf_hooks nf_iterate rcu read lock tcp_rcv_established tcp_v4_do_rcv nf_hook_slow nf_hook_thresh ___napi_schedule __napi_schedule e1000_intr handle_irq do_IRQ common_interrupt interrupt get_rps_cpu sock_queue_rcv_skb ip_queue_rcv_skb __udp_queue_rcv_skb udp_queue_rcv_skb __udp4_lib_rcv ip_local_deliver_finish NF_HOOK ip_defrag ip_rcv_finish NF_HOOK ip_rcv __netif
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